955 SmartCode™ Electronic Pembroke Lever featuring SmartKey Security™ took 45 minutes to in stall with help from my husband. It could have been install by one person but two makes it much easier. We had to remove the old door lock that we were changing. The directions that came in the box were a little unclear. We had to get a different size Allen key because they were two different size screws. Only one Allen key fitted . The code was easy to put in with two people. I was happy with the 955 SmartCode™ Electronic Pembroke Lever when we got it finished. The up date Satin Chrome finish gives my door a modern look. The gold set I had was out dated. For doors that needs the dead bolt they need to be purchased extra.